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2715 Spectrum Analyzer Service Manual
Table 1- 1: CATV Characteristics (Cont.)
Characteristic Description
Accuracy See Figure 1--1 on page 1--7
Desired-to-Undesired Ratio (Typical) Channel averaged power is divided by total noise plus distortion in the channel
Resolution 0.1 dB
Accuracy ±2 dB within the limits shown in Figure 1--6 on page 1--9
CTB Measurement (Typical) Composite triple beat (CTB) is measured relative to the visual carrier peak according
to the NCTA recommended spectrum analyzer settings — SINGLE-SWEEP mode
does not use all the NCTA recommended settings
Maximum Range See Figure 1--2 on page 1--7
Resolution 0.3 dB
Accuracy See Figure 1--2 on page 1--7
Digital Channel CTB (Typical) Measured relative to the averaged power of the test channel
Resolution 0.3 dB
Accuracy ±2 dB within the limits shown in Figure 1--8 on page 1--10
CSO Measurement
(Typical)
Composite second order (CSO) is measured relative to the visual carrier peak
according to the NCTA recomm ended spectrum analyzer settings — SINGLE-
SWEEP and CONTINUOUS modes do not use all the NCTA recommended settings
Optimum Input Range See Figure 1--3 on page 1--8
Maximum Range See Figure 1--3 on page 1--8
Resolution 0.3 dB
Accuracy See Figure 1--3 on page 1--8
In-Service CSO (Typical) CSO products are measured per NCTA recommendations during quiet lines in the
vertical interval, then expressed as dBc
Optimum Input Range See Figure 1--4 on page 1--8
Maximum Range See Figure 1--4 on page 1--8
Resolution 0.3 dB
Accuracy See Figure 1--4 on page 1--8
Digital Channel CSO (Typical) Measured relative to the averaged power of the test channel
Resolution 0.3 dB
Accuracy ±2.0 dB within the limits shown in Figure 1--7 on page 1--10
Frequency Response
Measurement (Typical)
For fixed-amplitude scrambling or no scrambli ng, system amplitude variations
(flatness) are measured relative to a reference trace (stored during the frequency
response reference setup)
Reference Trace Storage
(Nonvolati le)
Up to 10 traces with spectrum analyzer states
Range 5 dB/div, fixed
Resolution 0.2 dB
Trace Flatness Accuracy ±0.75 dB